import java.io.*;
class Fen{//分割文件
String fileName;//待分割的文件名
int size;//将大文件分成size大小的多个文件
Fen(String fileName,String size){
this.fileName = fileName;
this.size = Integer.parseInt(size)*1024;
}
public void cut()throws Exception{
int maxx = 0;
File inFile = new File(fileName);
int fileLength = (int)inFile.length(); //取得文件的大小
int value; //取得要分割的个数
RandomAccessFile inn = new RandomAccessFile(inFile,"r");//打开要分割的文件
value = fileLength/size;
int i=0;
int j=0;
//根据要分割的数目输出文件
for (;j< value;j++){
File outFile = new File(inFile.getName()+j+"zzii");
RandomAccessFile outt= new RandomAccessFile(outFile,"rw");
maxx+=size;
for (;i< maxx;i++){
outt.write(inn.read());
}
outt.close();
}
File outFile = new File(inFile.getName()+j+"zzii");
RandomAccessFile outt= new RandomAccessFile(outFile,"rw");
for(;i< fileLength;i++){
outt.write(inn.read());
}
outt.close();
inn.close();
}
}
class He{ //合并文件
String fileName;//将多个小文件合并成fileName
String filterName;//小文件的扩展名
He(String fileName,String filterName){
this.fileName = fileName;
this.filterName = filterName;
}
public void unite()throws Exception{
String [] tt;
File inFile = new File("."); //在当前目录下的文件
File outFile = new File(fileName); //取得输出名
RandomAccessFile outt= new RandomAccessFile(outFile,"rw");
//取得符合条件的文件名
tt = inFile.list(new FilenameFilter(){
public boolean accept(File dir,String name){
String rr = new File(name).toString();
return rr.endsWith(filterName);
}
});
//打印出取得的文件名
for (int i = 0;i< tt.length;i++){
System.out.println(tt[i]);
}
//打开所有的文件再写入到一个文件里
for(int i=0;i< tt.length;i++){
inFile = new File(tt[i]);
RandomAccessFile inn= new RandomAccessFile(inFile,"r");
int c;
while((c=inn.read())!=-1)
outt.write(c);
}
outt.close();
}
}
public class test{
public static void main(final String [] args)throws Exception{
if(args.length==0){
print();
return;
}
if(args[0].equals("-c")){
Fen cutt = new Fen(args[1],args[2]);
cutt.cut();
}
else if (args[0].equals("-r")){
He hee = new He(args[1],args[2]);
hee.unite();
}
else
print();
}
public static void print(){
System.out.println("usage:\n分: java test -c file1 size(单位为K)\n合 java test -r file2 zzii(我设置的方便标识)");
}
}
运行结果:
C:\java>java test
usage:
分: java test -c file1 size(单位为K)
合 java test -r file2 zzii(我设置的方便标识)
C:\java>java test -c ant.jar 100
C:\java>java test -r ant.jar zzii
ant.jar0zzii
ant.jar1zzii
ant.jar2zzii
ant.jar3zzii
ant.jar4zzii
ant.jar5zzii
ant.jar6zzii
ant.jar7zzii
ant.jar8zzii
ant.jar9zzii
ant.jar10zzii
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